/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieSceneEvaluationField.h
Add meta-data to this tree returning its index within this builder
A unique index for this meta-data within this builder, or INDEX_NONE if the meta-data is redundant
int32 AddMetaData ( const [FMovieSceneEvaluationFieldEntityMetaData](API\Runtime\MovieScene\Evaluation\FMovieSceneEvaluationFieldEntity-_2) & InMetaData )